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          SQL索引
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      <div class="mb-4 text-xs text-gray-500">2019-05-21</div>
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        啥是索引？
  索引由数据库表中的一列或多列组合而成，其作用是提高对表中数据的查询速度。不同存储引擎定义了每个表的最大索引数和最大索引长度。所有存储引擎对每个表至少支持16个索引，总索引长度至少为256字节，有些存储引擎支持更多的索引数和更...
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          Java.IO综述
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      <div class="mb-4 text-xs text-gray-500">2019-04-18</div>
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通过数据流，序列化和文件系统提供系统输入和输出。 除非另有说明，否则将null参数传递给此包中任何类或接口中的构造函数或方法将导致抛出NullPointerException 。

接口



接口
描述




Closeable
Cl...
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        <a href="https://JoyZgq.github.io/post/fXMc3StAj/" class="text-gray-700 dark:text-gray-200 border-b-2 border-dotted border-gray-200 dark:border-gray-400 dark:hover:border-gray-200 hover:border-gray-600 transition-all duration-100">
          Java.lang综述
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      <div class="mb-4 text-xs text-gray-500">2019-04-04</div>
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作用：提供对Java编程语言设计至关重要的类。 最重要的类是Object，它是类层次结构的根， 类 ，其实例表示运行时的类。通常，有必要将原始类型的值表示为对象。 该包装类Boolean ， Character ， Integer ， L...
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        <a href="https://JoyZgq.github.io/post/f67bU8eSc/" class="text-gray-700 dark:text-gray-200 border-b-2 border-dotted border-gray-200 dark:border-gray-400 dark:hover:border-gray-200 hover:border-gray-600 transition-all duration-100">
          Java Source --- CharSequence
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      <div class="mb-4 text-xs text-gray-500">2019-02-20</div>
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        Summary

CharSequence是char值的可读序列。 该接口提供对许多不同类型的char序列的统一，只读访问。char值表示基本多语言平面（BMP）中的字符或代理项。

  此接口不会细化equals和hashCode方法的常...
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        <a href="https://JoyZgq.github.io/post/jdk-souce-comparable/" class="text-gray-700 dark:text-gray-200 border-b-2 border-dotted border-gray-200 dark:border-gray-400 dark:hover:border-gray-200 hover:border-gray-600 transition-all duration-100">
          JDK Souce --- Comparable
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      <div class="mb-4 text-xs text-gray-500">2019-02-18</div>
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        概述😜😋🤡😣
  此接口对实现它的每个类的对象强加一个总排序。 这种排序被称为类的自然顺序 ，类的compareTo方法被称为其自然比较方法 。
  实现此接口的对象的列表（和数组）可以由Collections.sort （和Arr...
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          JDK Source --- Serializable
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      <div class="mb-4 text-xs text-gray-500">2019-02-02</div>
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        Summary 综述🤡👾😉

  实现java.io.Serializable接口的类启用了类的可序列化。未实现此接口的类将不会将其任何状态序列化或反序列化。可序列化类的所有子类型本身都是可序列化的。 序列化接口没有方法或字段，仅用于...
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          JDK Source --- java.lang.Number
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      <div class="mb-4 text-xs text-gray-500">2019-01-17</div>
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        <h3 id="numberjava">Number.java</h3>
<blockquote>
<p>实现的所有接口:Serializable</p>
</blockquote>
<h4 id="summary-综述">Summary 综述🤡👾😉</h4>

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